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When Junior’s Deli closed in late December, longtime customers lined up for a last, nostalgic nosh at the 53-year-old Los Angeles-area institution.

But Brian Won’s main reaction was “meh.”

“The food was unremarkable,” said the West Los Angeles IT specialist, 32, who visited to use up a Groupon voucher. “Given that there are so many good places to eat in L.A., I have a really hard time saying yes to that.”

The decline seems to be accelerating partly because of health concerns over the schmaltz-spread fare and partly because bagels are now available in every supermarket.

Add sides of restaurant-industry slump and rising lease rates, and even local landmarks aren’t immune.

In the past three months, three long-standing emporiums of corned beef and matzo around the country have closed.

Faced with aging clientele and a difficult economy, Ashkenaz Delicatessen in Chicago went dark in November and was replaced by a seafood joint called Da Lobsta.

In Manhattan, high rent and the recession led to the closure of 75-year-old Stage Deli.

“People don’t open up new delis anymore because it’s very, very difficult to do,” said Marian Levine, owner of Stage’s longtime rival, Carnegie Deli in Manhattan.

In the first half of the 20th century, several thousand Jewish delis were operating in New York.

But as Jewish immigration to the East Coast ebbed after World War II and younger generations splintered into the suburbs, the number has shrunk to a few dozen.

Southern California has suffered the same troubles bedeviling delis in the east.

Jerry’s Famous Deli closed its Costa Mesa, Calif., branch last spring and laid off dozens of employees. After years spent dishing up pickle-flanked masses of pastrami to the likes of Bruce Willis and Mel Brooks, Junior’s closed after a rental spat with its landlord.

“There’s nothing that can bring back the centrality of the deli in either Jewish life or American life,” said Ted Merwin, an expert on Jewish culture and a professor at Dickinson College in Pennsylvania. “There’s no way they’re going to survive in the numbers they once did.”

Jewish delis are also part of a restaurant sector that has struggled overall since the recession.

Sales at family sit-down restaurants stagnated between 2007 and 2011 and grew a stingy 0.5 percent last year, according to research firm Mintel.

The stress showed at Junior’s, where revenue slumped 20 percent in the past three years as food costs surged, the result of unpredictable weather affecting crops and animal feed. Rents are also rising, especially in urban centers, making property difficult to afford for all but the largest chain delis.

At Langer’s in Los Angeles, owner Norm Langer jacked up menu prices 4 percent in March. But the increase “wasn’t enough to compensate for the rising cost of food,” which he said has soared as much as 9 percent in the past 18 months.

Fish prices have “gone crazy,” said Langer, whose father launched the business 65 years ago.

The deli hasn’t sold barbecued cod in five years, when the seafood went from being a third cheaper than lox to a third more expensive and supply became unpredictable.

And with diners still wary after the downturn, even a pastrami sandwich as revered as his struggles when it costs more than $20 a person after a beverage, a side dish, tax and tip, Langser said.

“At Quiznos, you can buy a sandwich for lunch for $5,” he said. “That’s a third of the cost at a first-class deli. The deli has a better-quality product, but you’re going to be filled up with either option.”

Part of the problem is younger customers, said David Saul, who with his brother John had inherited Junior’s from their father, Marvin.

The deli always drew an older crowd, one that grew up eating at diners and other family-centric eateries.

But millennials, ages 18 to 34, “don’t understand delis or comfort food” and are “used to quick food and instant gratification, going through a drive-thru in 10 seconds,” Saul said.

Throughout the restaurant industry, young diners are driving the push toward hip, healthful and sustainable offerings. Delis, known for menus laden with cheesy blintzes and corned beef, have tried to adapt with more low-calorie dishes and local ingredients.

Art’s, which was launched by owner Ginsburg’s parents 55 years ago, now sells a “tremendous amount” of egg-white omelets and salads to cater to the body-conscious set, he said.

Jerry’s in West Hollywood, Calif., has a Louisiana burger, a Korean bibimbap bowl and fettuccine stroganoff on its sprawling menu. Before closing, Junior’s added gluten-free rugelach and vegan chopped liver with peas and lentils.

Many say the true Jewish deli renaissance is happening in the San Francisco Bay Area, where establishments such as Saul’s in Berkeley, Calif., and Wise Sons in San Francisco are experimenting with farm-to-table sourcing and ditching Dr. Brown’s celery soda for house-made beverages.

“A number of new delis have folded in with the artisanal movement and made the food trendier for the younger generation,” said David Sax, author of “Save the Deli.” “Hopefully it’s the green shoots of a recovery.”

On Feb. 7, the former Junior’s space got a second chance when another Jewish deli — Lenny’s — moved in.

But it’s not entirely traditional. Owner and serial restaurateur Lenny Rosenberg, whose father, a Holocaust survivor, ran Jewish bakeries in New York, said his eatery features more-healthful options and lower prices to bring the concept “into the 21st century.”